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Imperial Valet Timer only some zones work

My home was built in 1979 and my sprinkler system will only operate two zones. Where can I get a wiring diagram? Can anyone tell me what color wires go on which terminal (block) which are voltage inputs and outputs.

Imperial Valet timer

I am interested to know if you have actually limited the problem to the controller itself. Have you tested the terminals to determine that there is no power going out at that point? The Imperial Valet was a good workhorse timer that held up quite well. Usually the problem would be in the wiring when zones don't work: connections, cable, and especially in the case of multiple failures, the common wire. I have worked on Imperials a lot in the past and do have a few parts and a working old timer should you need them but I would go for the the wiring answer unless you are sure it is in the controller and if so I would check out the wafer switch in the back to see if it is making contact or if there is some type of soiling. You might even try a good contact cleaner like CRC on the wafer switch just to be sure.

Diagram

I am very electrical savy, when we moved here only 4 of the wires were attached. I hooked up the rest but the other zones do not work. I have a Fluke 87 and would need to know what voltages to look for on the terminal block. I do not have a drawing and I do not know what color wire should have what voltage and not sure what wire goes on what terminal. Do you have a drawing you can email me or post what goes on what terminal?

email address

How many zones is the system? Do you know where the individual zone valves are? If so, you might be able to look at the zone valves and reason out the wiring scheme. Are the zone valves Imperial brand? (this is important)
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In extreme cases, you have to resort to methodical detective work. Label every wire, whether in use or not. Starting with the wires in use, build a diagram of resistance measurements. Each wire to every other wire, one measurement at a time.
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There is a known long-term issue with some of these controllers where a zone no longer outputs power, and the easy workaround is to simply move the zone wire to another, unused zone. It's when you run out of unused zones, that you have to really deal with what's going on.

I'm not sure

We purchased the home two years ago and every station worked fine. I am not sure where the valves are so it will take some detective work. I think I have 6 to 8 zones (it has 10 dials). When i turn it on auto it will cycle through all the zones but only one zone works. It MAY turn off that zone and turn on ONE other zone but then that same zone (the one that came on to begin with) comes back on. It will not cycle through any of the other zones.

ohm meter

Without a wiring diagram or knowing what voltages I am looking for it will be difficult to trouble shoot. I really need to know what color wire gets hooked up to what (example Gray to valve) (blue to 24vdc)

There will never be a diagram marked with voltages for you to measure.
The back of the controller panel has line voltage running through it,
and you don't touch it. Leave it alone.
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The wires coming from the controller should still have readable markings on them, in the event you do not have a model with a terminal strip. Imperial used the color code that is used on electrical components.
Brown=1 Red=2 Orange=3 Yellow=4 Green=5 Blue=6 Violet=7
White is the common, and black is the master valve
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As for the wires in your own system, who knows? That's up to you to figure out.